I bought an Apple Watch series 9 from eBay and it should be here in a day or two. I bought the one that I did because I wanted to get 02 readings, in addition to being able to use all the other health monitoring features. A few years ago I broke my left arm into multiple pieces, and they put me back together with metal. The doctor said I'll never clear another scanner. I've been wearing a watch on my left arm since the 1960's, and it does not feel right not to have it there. Will the metal interfere with the Apple watch's ability to give accurate health readings? Will I need to switch to wearing it on my right arm for them to be accurate? TIA.